That difference between our results and experimental data may come
from the choice of parameters. In Fig. REF , we show
the results from different \(\mathcal {P}(b_{T}).\)  For the invariant
mass spectrum of the lepton pair, the result with \(\mathcal {P}(b_{T})\simeq w\) 
[1]} matches the data, but the transverse momentum
spectrum of the lepton pair is much higher than the data. The result
with \(\mathcal {P}(b_{T})\)  of Ref. [2]} under-estimate
both invariant mass and transverse momentum spectra. These results
imply that we need to study the parameter dependence systematically,
which we leave for a future study.
